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  • Would you be willing to consider writing a Chrome plugin? It naturally provides a background page to offload some processing so there is no need for a web worker, and it avoids any quota cap if you use the unlimited permission.
    – Josh
    Commented Jun 9, 2015 at 5:03
  • 4
    No, a chrome plugin would defeat the purpose of having it web-based. Chrome isn't the only browser around, and probably won't exist in 5 years anymore (or at least, if trends continue as they do, it will be replaced by something else).
    – user36129
    Commented Jun 9, 2015 at 6:57
  • For the record (1.5 years later): You can use the FileSystem API in Chrome - and only in Chrome, and it is no longer developed so won't appear in other browsers (in that form). Other than that IndexedDB indeed seems to be the only option, and an unreliable one since all data stored in it can disappear at any time if the browser decides so. So there really isn't any other (or any) good solution.
    – Mörre
    Commented Jan 26, 2017 at 16:07